It is never too late to do what you want to do. Some people continue to graduate school right away, but many do not. Personally, I didn't start my undergrad until I was 27, and married, and working fulltime. (Iwas an artist, I didn't need to go to school, come on!) 3 years later, I was pregnant, and that slowed things down significantly. Another kid happened and I found myself with a BFA at 36, and absolutely NO job prospects. After a failed MFA application round during my final year in undergrad, I decided that maybe I wanted to re-evaluate where I was going, and now here I am, ready to start my MA in Art History in the fall. Feeling too old is just a feeling. Don't let it get in your way. If I'm not too old at 37, and I'm not, you are definitely not too old at 27.